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Add a UUID Surrogate Key to Each Row in a CSV with Python

Generate a unique UUID string for every row in a CSV file using the standard-library uuid and csv modules.

import uuid
import csv

def add_surrogate_key(filename):
    with open(filename, newline='') as f_in:
        reader = csv.DictReader(f_in)
        rows = list(reader)

    for row in rows:
        row['surrogate_key'] = str(uuid.uuid4())

    with open(filename, 'w', newline='') as f_out:
        writer = csv.DictWri…

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